Equivalent of work pressure, love (4)
I believe the answer is:
oppo
'equivalent' is the definition.
(oppo can mean a peer or fellow)
'work pressure love' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'pressure' becomes 'p' (abbreviation).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'op'+'p'+'o'='OPPO'
'of' is the link.
(Other definitions for oppo that I've seen before include "Counterpart; rival" , "Opposite number (colloq.)" , "China" , "Colleague, friend (colloq.)" , "Mate" .)